Sewing-machine throat-plate.



G. H. TOWERS. SEWING MACHINE THROAT PLATE.

APPLICATION FILED-FEB. l, 1906.

Patented Sept. 29, 1908.

. lNl-ENTOR. M fi 25% BY WITNESSES A TTORNE Y.

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UNITED STATES PATENT- onmon.

CHARLES HENRY TOWERS, OF BALTIMORE, MARYLAND, ASSIGNOR, BY MESNE ASSIGNMENTS,

TO THE SINGER MANUFACTURING COMPANY, A

CORPORATION OF NEW JERSEY.

SE WIN G-MACHINE THRO AT-PLATE.

Specification of Letters Patent.

Patented Sept. 29, 1908.

Application filed February 1, 1906. Serial No. 298,969.

To all whom it may concern:

Be it known that I, CHARLEs HENRY Tow- ERS, a citizen of the United States, and resident of the city of Baltimore and State of 7 of the serrated surface of the feed-dog when,

for any pur ose, it is desired to manually control the iength and the direction of the stitch; for exam le, as when it is desired to fasten off the en of the seam, to do tacking, embroidering, etc.

In the accompanying drawings illustrating the invention, in the several figures of which like parts are similarly designated, Figure 1 is a front end elevation of the bed-plate of a sewing machine provided with my improved throat-plate, together with sufiicient of the cloth-feeding mechanism to show the ap lication of my invention, and Fig. 2 is a p an view of the throat-plate.

My invention is herein illustrated in connection with the well known Wheeler & Wilson sewin machine, commercially known as No. 61 (high speed), and the description of the machine may, therefore, be limited to the novel features comprising the present invention and the parts immediately cooperating therewith.

- 1 is the bed-plate of the sewing machine, 2 the presser-bar, 3 the presser-foot, 4 the presser-foot screw, 5 the pintle bearing for the feed rock-shaft 6 (the latter shown in dotted lines only), 7 the pintle bearing for the feed lift rock-shaft 8 (the latter shown in dotted lines only), 9, 9, the pintle bearing set-screws, and 10 the feed-bar, one end of which is pivoted by screw 11 to a lever 12 (shown in dotted lines only), which latter, in the present instance is formed integral with the feed rock-shaft 6, the opposite end of the feed-bar 10 being connected, through a slide block (not shown) mounted upon the inner end of the stud bolt '13, with an arm 14 projecting from the feed lift rock-shaft 8, the

said stud bolt 13 and block carried j ecting into a slot 15 formed in the feed-bar 10.

16 is the hook driving shaft, shown only in section, Fig. 1, and 17 is a nut for securing the bolt 13 in the arm 14 of the feed lift rockshaft 8.

18 is the feed-dog, secured by suitable screws, not shown, to the feed bar 10, all of which are in construction and operation sub stantially the same as in the No. 61 Wheeler & Wilson sewing machine hereinbefore referred to.

19 is a throatlate to the upper side of which is secured, y screws 20, 20, one end of a spring-plate 21 havin afeed opening 22 the opposite end of sai spring-plate being by it roend 0 the free to move upon, and in the direction of the length of said throat-plate, thus permitting the sprin to assume the half-elliptic position shown in ig. 1, or to be forced, by the action of the presser-foot, down upon the throatplate, as when the sewing machine is operated for eflecting an ordinary seam, it being understood that the presser-foot, when free to act, is held down upon the throat-plateby the resiliency of a suitable presser spring mounted upon the presser-bar in a manner common to sewing machines generally.

To insure that the needle hole 22, in the sprin -plate 21, will be held against accidental a justment, relatively to the needle hole 23 (shown in dotted lines, Fig. 1) in the throat-plate 19, I provide the spring-plate with a rib or offset portion 24, which is secured by the screws 20, -20, in a groove 25, formed in the throat-plate.

When it is desired to fasten off a seam or to form stitches at an angle to the line of the feed, it has been the general practice to slightly raise the presser-foot and control the movements of the material by shifting it manually to therequired positions, but in doing'so the serrated surface of the feed-dog would come in contact with the under surface of the material, making the control of the material diflicult; and to avoid this interference of the action of the feed-dog is one of the objects of my improved construction.

Again, when it is desired to do embroidering, it has been the common practice to remove through holes 28, 28, in the spring-plate 21 and threaded into the bed-plate.

What I claim is the feed-dog from the feed-b ar and secure the presser-foot elevated above the throat-plate a distance of substantially the thickness of the material being operated upon. My improved construction avoids the necessity of removing the feed-dog and at the same time, by restoring the resser-foot to its normal adjustment, leaves the sewing machine in condition for effecting the ordinary seam.

The lugs 26, 26, formed on the underside of the throat-plate for the reception of the bobbin-case stop finger, are the same as are l t In a sewing machine the combination with i a presser-foot, a throat-plate provided with the usual opening for the feed dog, a spring plate having a corresponding feed opening mounted on said throat-plate, and adapted to raise the material operated upon above the surface of the feed-dog, as specified.

Signed at the city of Baltimore, and State of Maryland, this 24th day of J anuary A. l).

the bed-plate 1 by the commonly employed throat-plate screws, not shown, passing commonly employed in the construction of 1906. Wheeler & Wilson sewing machine herein re i CHARLES HENRY TOWERS. ferred to. The throat-plate 19 is secured on Witnesses:

M. G. FINoIIER, WM. SLATER. 

